From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E24EEC433E0 for ; Fri, 29 May 2020 00:10:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B24EF206C3 for ; Fri, 29 May 2020 00:10:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2438054AbgE2AKg (ORCPT ); Thu, 28 May 2020 20:10:36 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48176 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2438050AbgE2AK0 (ORCPT ); Thu, 28 May 2020 20:10:26 -0400 Received: from ZenIV.linux.org.uk (zeniv.linux.org.uk [IPv6:2002:c35c:fd02::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 59B07C08C5C8; Thu, 28 May 2020 17:10:25 -0700 (PDT) Received: from viro by ZenIV.linux.org.uk with local (Exim 4.93 #3 (Red Hat Linux)) id 1jeSbP-00HEZS-80; Fri, 29 May 2020 00:10:23 +0000 From: Al Viro To: Linus Torvalds Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: [PATCH 1/3] compat sysinfo(2): don't bother with field-by-field copyout Date: Fri, 29 May 2020 01:10:21 +0100 Message-Id: <20200529001023.4107547-1-viro@ZenIV.linux.org.uk> X-Mailer: git-send-email 2.25.4 In-Reply-To: <20200529000957.GW23230@ZenIV.linux.org.uk> References: <20200529000957.GW23230@ZenIV.linux.org.uk> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org From: Al Viro Signed-off-by: Al Viro --- kernel/sys.c | 33 +++++++++++++++++---------------- 1 file changed, 17 insertions(+), 16 deletions(-) diff --git a/kernel/sys.c b/kernel/sys.c index d325f3ab624a..b4a0324a0699 100644 --- a/kernel/sys.c +++ b/kernel/sys.c @@ -2634,6 +2634,7 @@ struct compat_sysinfo { COMPAT_SYSCALL_DEFINE1(sysinfo, struct compat_sysinfo __user *, info) { struct sysinfo s; + struct compat_sysinfo s_32; do_sysinfo(&s); @@ -2658,23 +2659,23 @@ COMPAT_SYSCALL_DEFINE1(sysinfo, struct compat_sysinfo __user *, info) s.freehigh >>= bitcount; } - if (!access_ok(info, sizeof(struct compat_sysinfo)) || - __put_user(s.uptime, &info->uptime) || - __put_user(s.loads[0], &info->loads[0]) || - __put_user(s.loads[1], &info->loads[1]) || - __put_user(s.loads[2], &info->loads[2]) || - __put_user(s.totalram, &info->totalram) || - __put_user(s.freeram, &info->freeram) || - __put_user(s.sharedram, &info->sharedram) || - __put_user(s.bufferram, &info->bufferram) || - __put_user(s.totalswap, &info->totalswap) || - __put_user(s.freeswap, &info->freeswap) || - __put_user(s.procs, &info->procs) || - __put_user(s.totalhigh, &info->totalhigh) || - __put_user(s.freehigh, &info->freehigh) || - __put_user(s.mem_unit, &info->mem_unit)) + memset(&s_32, 0, sizeof(s_32)); + s_32.uptime = s.uptime; + s_32.loads[0] = s.loads[0]; + s_32.loads[1] = s.loads[1]; + s_32.loads[2] = s.loads[2]; + s_32.totalram = s.totalram; + s_32.freeram = s.freeram; + s_32.sharedram = s.sharedram; + s_32.bufferram = s.bufferram; + s_32.totalswap = s.totalswap; + s_32.freeswap = s.freeswap; + s_32.procs = s.procs; + s_32.totalhigh = s.totalhigh; + s_32.freehigh = s.freehigh; + s_32.mem_unit = s.mem_unit; + if (copy_to_user(info, &s_32, sizeof(s_32))) return -EFAULT; - return 0; } #endif /* CONFIG_COMPAT */ -- 2.11.0